Remove redundant files.

app/assets/stylesheets/includes/_box_shadow.sass

@@ -1,4 +0,0 @@
-@mixin box-shadow($value)
-  -webkit-box-shadow: unquote($value)
-  -moz-box-shadow: unquote($value)
-  box-shadow: unquote($value)

app/assets/stylesheets/includes/_round_corners.sass

@@ -1,5 +0,0 @@
-@mixin round-corners($radius)
-  border-radius: $radius
-  -moz-border-radius: $radius
-  -webkit-border-radius: $radius
-  -o-border-radius: $radius

app/assets/stylesheets/includes/_transition.sass

@@ -1,5 +0,0 @@
-@mixin transition($value)
-  -moz-transition: $value
-  -webkit-transition: $value
-  -o-transition: $value
-  transition: $value

app/assets/stylesheets/includes/_v_linear_grad.sass

@@ -1,7 +0,0 @@
-@mixin v-linear-grad($from, $to)
-  background-image: -moz-linear-gradient(top, $from 0%, $to 100%)
-  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, $from), color-stop(100%, $to))
-  background-image: -webkit-linear-gradient(top, $from 0%, $to 100%)
-  background-image: -o-linear-gradient(top, $from 0%, $to 100%)
-  background-image: -ms-linear-gradient(top, $from 0%, $to 100%)
-  background-image: linear-gradient(top, $from 0%, $to 100%)

app/assets/stylesheets/photos.css.sass

@@ -1,5 +1,3 @@
-@import "includes/box_shadow"
-
 *
   box-sizing: border-box